I have a 6S and i was talking to my husband on my sync system in the car. All of a sudden it said that my phone was disconnected (i thought i had left my phone at home). I pulled out my phone and it was restarting. Haven't had any other issues like that since then today. I am going into the Apple store on Saturday to have them look at my phone for the music issue which is continuing to drive me nuts 🙁.